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17<title>Debugging with GDB: File Caching</title>
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64<a name="File-Caching"></a>
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67Next: <a href="Separate-Debug-Files.html#Separate-Debug-Files" accesskey="n" rel="next">Separate Debug Files</a>, Previous: <a href="Files.html#Files" accesskey="p" rel="previous">Files</a>, Up: <a href="GDB-Files.html#GDB-Files" accesskey="u" rel="up">GDB Files</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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70<a name="File-Caching-1"></a>
71<h3 class="section">18.2 File Caching</h3>
72<a name="index-caching-of-opened-files"></a>
73<a name="index-caching-of-bfd-objects"></a>
74
75<p>To speed up file loading, and reduce memory usage, <small>GDB</small> will
76reuse the <code>bfd</code> objects used to track open files.  See <a href="http://sourceware.org/binutils/docs/bfd/index.html#Top">BFD</a> in <cite>The Binary File Descriptor Library</cite>.  The following commands
77allow visibility and control of the caching behavior.
78</p>
79<dl compact="compact">
80<dd><a name="index-maint-info-bfds"></a>
81</dd>
82<dt><code>maint info bfds</code></dt>
83<dd><p>This prints information about each <code>bfd</code> object that is known to
84<small>GDB</small>.
85</p>
86<a name="index-maint-set-bfd_002dsharing"></a>
87<a name="index-maint-show-bfd_002dsharing"></a>
88<a name="index-bfd-caching"></a>
89</dd>
90<dt><code>maint set bfd-sharing</code></dt>
91<dt><code>maint show bfd-sharing</code></dt>
92<dd><p>Control whether <code>bfd</code> objects can be shared.  When sharing is
93enabled <small>GDB</small> reuses already open <code>bfd</code> objects rather
94than reopening the same file.  Turning sharing off does not cause
95already shared <code>bfd</code> objects to be unshared, but all future files
96that are opened will create a new <code>bfd</code> object.  Similarly,
97re-enabling sharing does not cause multiple existing <code>bfd</code>
98objects to be collapsed into a single shared <code>bfd</code> object.
99</p>
100<a name="index-set-debug-bfd_002dcache-level"></a>
101<a name="index-bfd-caching-1"></a>
102</dd>
103<dt><code>set debug bfd-cache <var>level</var></code></dt>
104<dd><p>Turns on debugging of the bfd cache, setting the level to <var>level</var>.
105</p>
106<a name="index-show-debug-bfd_002dcache"></a>
107<a name="index-bfd-caching-2"></a>
108</dd>
109<dt><code>show debug bfd-cache</code></dt>
110<dd><p>Show the current debugging level of the bfd cache.
111</p></dd>
112</dl>
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